| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a delay of initial responsiveness of brake fluid pressure by impressing a bias current of a degree of not generating brake fluid pressure on a proportional control valve even at nonbraking time when a brake pedal is not stepped down. SOLUTION: A control current of a bias current value in a degree of not generating brake fluid pressure is impressed on a proportional control valve 9 at nonbraking time when a brake pedal 1 is not stepped down. That is, a braking current is set so that the proportional control valve 9 stops in a position just before starting operation such as generating brake fluid pressure while microscopically vibrating. Then, as soon as a brake command current value is generated since the brake pedal 1 is stepped down, a valve element in the proportional control valve 9 can smoothly transfer to brake fluid pressure generating operation by the microvibration. With such constitution, since a delay of initial responsiveness of the brake fluid pressure is improved, an effect delay feeling is eliminated. |
